EUVD-2026-62726
GHSA-pmq5-6568-8497
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable unauthenticated SSL endpoint; no credentials needed; impact confined to availability via resource exhaustion with no confidentiality or integrity effect.
Primary rating from Vendor (ibm).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service due to improper handling of a missing SSL client certificate.
AnalysisAI
Remote denial of service in IBM AIX 7.2 and 7.3 and IBM PowerVM VIOS 4.1 allows unauthenticated network attackers to crash or exhaust resources in the SSL subsystem by omitting an expected client certificate during the TLS handshake. The CVSS 7.5 rating (AV:N/AC:L/PR:N/UI:N) confirms low attack complexity with no authentication required, making exploitation straightforward against any exposed SSL service on affected systems. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a service on the affected IBM AIX 7.2/7.3 or PowerVM VIOS 4.1 system is (1) running an SSL/TLS listener that is configured to request or require client certificate authentication (mutual TLS), and (2) reachable by the attacker over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 with a fully remote, unauthenticated, low-complexity vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) indicates that any network-reachable SSL endpoint on the affected system is a viable attack surface requiring no credentials or special conditions from the attacker's side. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker on the network initiates an SSL/TLS handshake to an AIX or VIOS service that expects mutual TLS client authentication, deliberately omitting the client certificate in the ClientCertificate message. The server-side SSL implementation fails to properly handle this missing certificate, triggering resource exhaustion or a crash of the affected service. … |
| Remediation | IBM has released a patch per the vendor advisory at https://www.ibm.com/support/pages/node/7283858; the exact fix version or PTF number must be retrieved directly from that page, as no specific version string was included in the available intelligence. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all IBM AIX 7.2, 7.3, and PowerVM VIOS 4.1 systems in your environment, with particular focus on any that expose SSL services externally or handle business-critical functions. …
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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